We've known this has been in the works for a while, but over the weekend at SDCC the first real trailer was released!  "The Lego Batman Movie" features an amazing voice cast which includes Will Arnett, Ralph Fiennes, Michael Cera, Zach Galifianakis, Rosario Dawson, and Mariah Carey (yup, you read that right).  No word yet if Wyldstyle will make an appearance, but given [...]